EECE 276 – Embedded SystemsHC12 Interfaces 1EECE 276Embedded SystemsHC 12 Overview: Interface devicesICE/LAN debugging toolsEECE 276 – Embedded SystemsHC12 Interfaces 2HC12 InterfacesO 9S12DP256: Complex HC12 system» HC12 here means: 9S12DP256O On-chip memory» EEPROM (4K)»RAM (12K)» Flash (256K)- tricky to accessO Various operating modes (see ref. guide)EECE 276 – Embedded SystemsHC12 Interfaces 3HC12 InterfacesO Enhance Capture Timer» Similar to HC11 timer unit: – Input capture, output compare, pulse accumulatorO Serial Communication Interface» DUART – Asynchronous (w/o clock line)O Serial Peripheral Interface» Synchronous, serial portO Inter-IC Bus» 2-wire, bidirectional serial bus (100KBPS)EECE 276 – Embedded SystemsHC12 Interfaces 4HC12 InterfacesO Motorola Scalable Controller Area Network (CAN)» CAN is a serial bus/protocol, widely used in automotive manufacturing» Data rates up to 1Mbps» MSCAN is an implementation of itO Analog to Digital Converter» 8/10 bit S/A converterO Byte Data Link module» SAE J1850 serial communication protocolO BDM: Background Debug Module» HW Support for debugging another device (aka mini-ICE)O BKP: Breakpoint Module» HW support for breakpointsEECE 276 – Embedded SystemsHC12 Interfaces 5Development tools: LANLogic Analyzer» Multi-channel digital scope» Connected to the bus signals of a micro system» Samples and stores signal state in memory» Logic analysis:– Timing analysis: sampling signals according to an external (asynchronous) clock– State analysis: sampling is triggered by an internal event (e.g. E-clock on 68HC11)» Display: – Timing diagram, Hex address/data, InstructionsEECE 276 – Embedded SystemsHC12 Interfaces 6Development tools: LANLogic Analyzer» HP 1650A: 80 channels, 100 MSamples/sec, 1kbit/channel storage» Qualification/triggering: Sample only when needed– When a certain combination appears on Address/Data bus lines (‘don’t-care’-s allowed)– Trigger based on previous or simultaneous events– Chained conditions (“sequence levels”)– Prestore: (e.g. store instructions to determine which has modified a memory location)– Cross triggering: O State analysis – triggers-> Timing analysisEECE 276 – Embedded SystemsHC12 Interfaces 7Development tools: ICEIn-Circuit EmulatorMP BoardSOCKICECPUCPU Hardware Emulator»It emulates in HW what the CPU is doing» PC is used to control the emulation processEECE 276 – Embedded SystemsHC12 Interfaces 8Development tools: ICEMetaLink ICE Services: Define/configure memory (address, size, type) Download program, take snapshot of memory Execute code, control code execution Breakpoints on: Code, write access, write protect violation Trace buffer: stores executed instructions Search for frames in Trace Buffer Complex breakpoints: Logic functions over address (bits), opcode values, etc. Symbolic debugging support (ASM, C) Performance analyzer:  Where does the program spend its time? Raw data on signals (waveforms) Direct manipulation of CPU